drop table customer;

create table customer(
	id number(5) primary key,
	cname varchar2(20),
	age number(2),
);

create sequence chuance_seq02;
insert into customer(id,cname,age)
value (chuance_seq02.nextval,'jhon',100);
insert into customer(id,cname,age)
value (chuance_seq02.nextval,'jhon1',100);
select* from customer;